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  1. We recently received a UM2 at my work a week ago and have been playing with it. We've switched plastics (ABS and PLA) and printed a multitude of things that came out with relativly great precision. This week we've run into some issues. At first the printer would move and not extrude. I figured out that the grooved cylinder sheathed over the stepper motor (the feed) had slipped. Initially the cylinder slipped around the axle, then later it slipped along the axle. In order to tighten this down in the right position I had to remove plastic from the feed's housing (seen below) otherwise the filament just fell behind the cylinder. <a href="http://imgur.com/hSG7w9O"><img src="http://i.imgur.com/hSG7w9O.jpg" title="Hosted by imgur.com"/></a> Due to the plastic sitting inside the extruder for so long at temps it formed a clog. So our prints came out unfinished and looked like this. <a href="http://imgur.com/SQdZyJn"><img src="http://i.imgur.com/SQdZyJn.jpg" title="Hosted by imgur.com"/></a> <a href="http://imgur.com/WKMK69F"><img src="http://i.imgur.com/WKMK69F.jpg" title="Hosted by imgur.com"/></a> A small wire brush wire and heating the nozzel to 260C helped push out the following buggers. <a href="http://imgur.com/UQMpC3H"><img src="http://i.imgur.com/UQMpC3H.jpg" title="Hosted by imgur.com"/></a> The extrude still compes out at a sharp angle when extruding in free space and it causes the poly to gunk up on the nozzel (seen in the vid below). Is this because the nozzel is still clogged? It used to extrude strait down. <embed width="440" height="420" type="application/x-shockwave-flash" src="http://v8.tinypic.com/player.swf?file=2hrzrbs&s=8"><br><font size="1"><a href="http://tinypic.com/player.php?v=2hrzrbs&s=8">Original Video</a> - More videos at <a href="http://tinypic.com">TinyPic</a></font> NOW, after all of this i started a print and it was coming out great UNTIL this happened.. <a href="http://imgur.com/3hGKwWW"><img src="http://i.imgur.com/3hGKwWW.jpg" title="Hosted by imgur.com"/></a> An enire layer is missing large sections and has burnt poly globs in it. <a href="http://imgur.com/K3GEd6A"><img src="http://i.imgur.com/K3GEd6A.jpg" title="Hosted by imgur.com"/></a> Finally to the bulk of my questions.. Is my nozzel still clogged? ive tried heating to 260C and poking in the nozzel a few times. It will extrude but still at the angle and a little black poly comes out from the heat up each time. Does this look more like an issue with my stepper or the nozzel? Thanks for any help!
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